Front hand elevator for arms



L. L. scHAuER FRONT HAND ELEVATOR FORARMS Filed June 1:5 1921 March 9 1926.

March 9 1926. 1,576,473

L. L. SCHAUER FRONT HAND ELEVATOR FOR ARMS Filed June 13, 1921 2 Sheets-Sheet 2- i TafulNvEyoR I ATTORNEY Patented Mar. 9, i826.

unrrsn STATES PATENT OFFICE.

LAWRENCE LEE sermons, on cinoInnA-rr'onio, ASSIGNOR TO THE oinornnarr BICKFORD TOOL COMPANY, or crncrnnarr. OHIO, aoonronnrron or 01110.

FRONT HAND ELEVATOR FOR ARMS.

Application filed June 13,

To all whom it may concern:

Be it known that I, LAWRENCE Lnn SCHAUER, a citizen of the United States, and residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Front- Hand Elevator for Arms, of which the following spcc1fication is aiull disclosure.

This invention is directed to improvements in the means for adjustably supporting the table of a drilling-machine at various heights with respect to the bed and it proposes a simple and self-contained structural arrangement whereby the elevation may be manually effected by the user when standing immediately adjacent the table.

In drilling-machines, as in all other species of machine tools, the arrangement must be such as to satisfy many desideratums and much difiiculty was frequently"experienced in'etl'ectively meeting all of such requirements on account of the fact that many of them are more or less structurally incompatible. In the case of the elevatinganech anism for the table-supporting arm of .lrilling-machine, some species of irreversible transmission is habitually employed in order to prevent the weight of the table from causing the shafts to rotate and permit the table to descend. In certain types of drilling-machines, a power-driven nut-and-screw is conventionally resorted to for this purpose, but, in the case of smaller machines (where the elevating power is derived from the user) it has been found desirable to accomplish the elevation by means of a rackand-pinion. One reason for this is that a rack is more compatible, with the provision of means for permitting the arm to swing about the post, than a nut-and-screw because the screw must be journaled at its ends so as to permit oi"- av rotation and it must also be capable of bodily revolving about the axis of the column. In the case of rack, it is su'liicient'merely to malre provision tor the bodily revolution of the rack; inasmuch as it does not rotate about its own axis and, consequently, a much simpler structure can be employed. A racl-r-and pinion, however, is not irreversible and, accordingly, it is essential to interpose, between the hand-actuated shaft and the pinion engaging the rack, a species of irreversible transmission device. Usually the irreversible device takes the form of a worm- 1921. Serial No. 477,145.

and-gear, and this 'unit has, heretofore, been mounted directly on that portion of the arm which circumscribes the post or column and it has, l1eretofore,been essential for the user to wall: to the column whenever it became desirable to adjustthe height of the arm. That structure not only had the objection of inconvenience, as will be perceived, but it likewise produced a veryunsightly machine; inasmuch'as the irreversible unitrequired considerable space and had to be located in a. casing having the appearance of a, protuberance formed on the column-end oi the arm. A further difiiculty was, in the circumstances, encountered by reason of the fact that the circumscribing portion of the arm washabitually split in the plane of its longitudinal axis and this not only created diiliculties in the assembling of the arm on the post but it also gave rise to much trouble in respect to assembling the irreversible unit and the (to-operating rack-a.11cl-pinion. It is very desirable to inspect these parts at in frequent intervals, but such inspection was virtually prohibited by the ai oresaid'incon venient conventional arrangement.

This invention, however, proposes an arraugenient (A) whereby the irreversible unit will be located on the forward endof thearm underneath the table, where there is ample unoccupied space, so as to relieve the column-circumscribing end of the sleeve from the unsightly protuberance; (B) to enable the user to raise and lower the table supporting arm without moving from his normal working-station; (C) to permit the pinion, the worm and the gear each to be readily assembled for purpose ot'inspection or replacei'nent without disturbing the assembly oi" the arm on the post and without necessitating the removal of. the rack; (D) to achieve the foregoing results in a. manner entirely compatible with an improved arrangement with respect to the arm and the 1308bf210llltt1ting the employment of a boxtype arm having its post-oircumscribing portion split transversely to its longitudinal axis in combination with an easily removable end-cap, thereby permitting the rack and other parts veryreadily to be assembled with relation to the post, 7 V

. Other objects and advantages will be in part indica-tedin the following description and in part rendered apparent therefrom in connection with the annexed drawings.

To enableothers skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention, drawings depicting a. preferred typical con.- struc'tion have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote corresponding parts throughout all the views, of which Fig. 1 is a side-elevation of a drillingmaehine embodying this improvement. Fig. 2 is a plan of the table and arm assembled on the post. Fig". 3' is a front elevation of the machine.

Referring to the drawings, a colun'm '2 is, by means of its foo-t 29, shown secured to a suitable base or bed 1; the column having" an upper portion 2 for supporting a drillcarrying arm (not shown) which is usually adapted to be bodily raised and lowered on slide-ways 40. The portion of the column between the part 2 and the foot 29 is devoted to the support of the work-table arm which is capable of being raised and lowered thereon, and is also capable of being swung laterally, partially or wholly, to one side to accommodate different classes of work. The table supporting arm, herein designated by at. is preferably constructed in the manner disclosed in detail in the co-pending application of David C. Klausn ieyer, filed May 20, 1921, Serial Number 471,074 as well as certain other features hereinafter briefly described but to which no claim is herein made; save in combination, as indicated by the appended claims.

The rear end of this arm at circumscribes the post 3 and consists of a semi-circular seat 5 and a cap 8 which is securely bolted thereto by means of a shaft 21 operating through lugs 6 and 9; the shaft 21 extending (parallel with the longitudinal axis of the arm) through the bearing 22 and ter urinating underneath the table with a squared end, whereby it may be manually manipulated. It will be noted that the split 12 in the arm is in a plane transverse to the l ongitudinal axis of the arm; thereby enabling tne cap 8 very easily to be removed. and permitting the employment of a boxtype arm so as to secure great rigidity in the supportingof the table.

The table indicated by 18 is provided with an annular seat 19 resting on a corresponding rigid seat provided by the forward end of'the arm, and said table has a hub 20 which extends downwardly through a vertical hole 13 provided by the free end of the arm. In order for the table to be clamped rigidly in place, the forward end of the arm is pro vided with flexible wings 14 and '15 which may be drawn together by the bolt 16 when operated by the handle 17.

Further rigidity-is secured by means of an instrumentality in the nature of an ad justable travelling support comprising the elements 23 and 24; said parts having been fully described in the aforesaid application.

The elevation of the arm is achieved through'an instrumentality which comprises a. rack 25 that, at its inner surface is slightly curved in conformity with the periphery of the cylindrical column 3, so that it may be bodily carried about such periphery as the arm is swung one way or another. This rack is contained in a vertically elongated channel 26 provided in part by the arm proper and in part by the cap 8, as appears best by Fig. 2; making it a simple manner to assemble parts in the course of manufacture. The rack is located between the upper and lower annular shoulders 27 and 28 which prevent it from moving longitudinally: said rack normally resting firmly on the lower shoulder 28 which is in the nature of a bearor race-way.

{lo-operating with the rack 25 is a pinion 33; this pinio nbeing; journaled in the boss 31 provided by the flange 10 of the cap 8. The pinion is secured to the end of a shaft 32 that extends forwardly through its journal in the boss 30. This provides an adequate iearinn' for the parts mentioned and at the same time enables the shaft 32 easily (when disconnected at its forward end) to be moved rearwardly to expose the pinion without dismounting any of the parts here tofore mentioned.

The irreversible unit is contained within a casing Sl- (ei'ther bolted to, or forming a part of, the forward end of the arm) underlying the table and consequently is located out of the way. This irreversible unit comprises a worm-wheel -36 that is secured to the forward end of the shaft 32; said shaft being journaled at and provided with a nut 37 which may be removed to release the worm-wheel and permit the shaft to be axi ally withdrawn. A worm 39 is transversely journaled within the casing 84 in mesh with the worm wheel 36; said worm being mounted on a shaft 38 which protrudes laterally and is provided with a squared end, whereby it may be manually rotated by the user when stationed immediately adjacent the table. This enables him to raise and lower the table without going to the rear.

It will thus be perceived, that this invention, in a simple and direct manner, has achieved the objects and advantages set forth in the foregoing and but few parts are necessitated by its structure.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for various utilizations by retaini'r'ig one or more of the essential characteristics of either the generic or specific aspects of this invention, and therefore, such adaptations should be, and are 1I1tI1Cled to be, comprehended within the meaning andfrange of equivalency of the following claims.

Having thus revealed this invention, 1 claim asnew and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of the United States:

1. A machine-tool combining a column; a box-type arm extending transversely from said column and mounted to rotate and to slide axially thereon; a work-support rotatably mounted on, but bodily fixed to the free end of said arm; means to clamp said work-support in adjusted positions; means to clamp said arm non-rotatively upon said column; means to cause axial movements of said arm on said column; means located adjacent the free end of the arm and in lixed position with respect to said Work-sup port for actuating said arm clamp and said elevating means; and an adjustable support for said arm, said support being. carried by the free end of the arm adjacent the actuating means for said clamp and arm elevating means. 7

A machine-tool combining a column; a box-type arm extending transversely, therefrom and mounted to rotate and to slide axially thereon; a work -support carried by the free end of said arm; means to clamp said work-support in adjusted position; means to clamp said arm non-rotatably upon said column; means to cause axial movements of said arm on said column; and ad justable means carried by said arm to support the free end thereof, said several means embodying controlling devices grouped upon the forward end of said arm, under said work-support, and there operable manually in the respective adjusted positions of said arm and work-support.

A drillin -machine combining a cylindrical column; an arm radiating therefrom and having its rear end in the form of a sleeve split transversely to the length of said arm; a work-support located upon the forward end of said arm, means embodying reduction gearing and located at the forward end of said arm for enabling it to be manually elevated; and means accessible at the forward end of said arm for manually clamping it on said column.

4. A drilling-machine combining a cylindrical column; an arm radiating therefrom and having a semi-cricular rear-end bearing on said column; a semi-circular cap bolted to the rear-end of said arm, the plane of division between said cap and arm extending transversely to the length of said arm, said parts providing a recess cut by the plane of division; a rack bodily rotatable with said arm and located in said recess; a cl'ai'np for constricting the other side of said cap, and means manuall ope able from the front end of said arm for elevating it through the instrumentality of said rack and for clamping it to said column.

5. A machine-tool, combining a column; a box-type arm extending transversely therefrom and having a sleeve mounted to rotate and to slide axially on said column; a racl; confined by, and revoluble bodily with, said. sleeve; a shaft of substantial length journalod at one end in a bearing afforded by said'sleeve and at its other end in a bearing carried by the outer end of said arm, said shaft having on one end a pinion journaled in said sleeve engaging with said rack and operable to cause axial movements of said arm; and reduction gearing at the forward end of said arm and connecting with said shaft, having manual operating devices also at said forward end, whereby said arm may be elevated, and retained in its various positions, against gravity.

6. A machine-tool combining a column; a box-type arm extending transversely there-- from and formed'at its rear end with a split sleeve adapted to rotate and to slide axially on said column, an arm-elevating device associated withsaid split sleeve at one side of said column; an arm-clamping device connected with said sleeve at the opposite side of said column; a first shaft journaled lengthwise of said arm at one side thereof and operatively connected with said armelevating device; a second shaft journaled lengthwise of the arm at the side thereof opposite said first shaft and affording means for operating said clamping device; a work-support mounted adjustably on tl e free end of said arm; means to clamp said work-support in adjusted positions; adjustable means for supporting the free end of said arm; a third shaft journaled in said arm transverse to said first shaft; a speedreduction gearing between said first and third shafts; said second and third shafts, work-support clamping means, and armsupport adjusting means being so construct ed and arranged as to be manually adjusted from a single position adjacent the forward end of the arm.

In witness whereof, I hereunto subscribe my name.

LAVVRENOE LEE SGHAUER. 

